An Agar.io-like game where you avoid the dots like obstacles is a good idea. I like your choice of colors, sound effects, and music, it gives a cool vibe
I like how the screen shake is specifically used for the lives/score indicator and the player sprite; it gives each hit more impact without being distracting. Also, great choice in sound effects
The shaking effect on the health bar was a great touch, it makes the loss of health have more impact. And the death animation transitioning to the game-over screen felt right out of a classic metroidvania. Nice job!